Oops, it doesn't look like 'autoresponder appreciation day' is a national day..

Other days

pampering

Pampering Day
camera

Camera Day
offer

Offer Day
prosecco

Prosecco Day
cuddle up

Cuddle Up Day
unicorn

Unicorn Day
eat what you want

Eat What You Want Day
lumpy rug

Lumpy Rug Day
ruby

Ruby Day
self appreciation

Self Appreciation Day